<template>
  <s-layout title="签字" :bgStyle="{ color: '#FFF' }">
    <view>
      <view class="wrapper" :style="{ height: `calc(100vh - ${hh}px - 8rpx)` }">
        <view class="handBtn">
          <!-- <image @click="selectColorEvent('black','#1A1A1A')" :src="selectColor === 'black' ? '/static/img/sign/color_black_selected.png' : '/static/img/sign/color_black.png'"
					 :class="[selectColor === 'black' ? 'color_select' : '', 'black-select']"></image>
					<image @click="selectColorEvent('red','#ca262a')" :src="selectColor === 'red' ? '/static/img/sign/color_red_selected.png' : '/static/img/sign/color_red.png'"
					 :class="[selectColor === 'red' ? 'color_select' : '', 'black-select']"></image> -->
          <button @click="retDraw" class="delBtn">重写</button>
          <!-- <button @click="saveCanvasAsImg" class="saveBtn">保存</button> -->
          <button @click="previewCanvasImg" class="previewBtn">预览</button>
          <!-- <button @click="uploadCanvasImg" class="uploadBtn">上传</button> -->
          <button @click="back" class="backBtn">返回</button>
          <button @click="subCanvass" class="subBtn">确 定</button>
        </view>
        <view class="handCenter">
          <canvas
            class="handWriting"
            :disable-scroll="true"
            @touchstart="uploadScaleStart"
            @touchmove="uploadScaleMove"
            @touchend="uploadScaleEnd"
            canvas-id="handWriting"
          ></canvas>
        </view>
        <view class="handRight">
          <!-- <view class="handTitle">请签名</view> -->
        </view>
      </view>
    </view>
  </s-layout>
</template>

<script>
  // import config from '@/common/config.js';
  import cfg from '@/sheep/config';
  // const uploadUrl = 'https://shop.hsintiao.com/addons/shopro/second.Letter/saveSign';
  // import {
  // 	save_agreement_fileFile_api
  // } from '@/api/second.js'
  import sheep from '@/sheep';
  import { Base64 } from 'js-base64';
  export default {
    data() {
      return {
        canvasName: 'handWriting',
        ctx: '',
        canvasWidth: 0,
        canvasHeight: 0,
        transparent: 1, // 透明度
        selectColor: 'black',
        lineColor: '#1A1A1A', // 颜色
        lineSize: 1.5, // 笔记倍数
        lineMin: 0.5, // 最小笔画半径
        lineMax: 4, // 最大笔画半径
        pressure: 1, // 默认压力
        smoothness: 60, //顺滑度，用60的距离来计算速度
        currentPoint: {},
        currentLine: [], // 当前线条
        firstTouch: true, // 第一次触发
        radius: 1, //画圆的半径
        cutArea: {
          top: 0,
          right: 0,
          bottom: 0,
          left: 0,
        }, //裁剪区域
        bethelPoint: [], //保存所有线条 生成的贝塞尔点；
        lastPoint: 0,
        chirography: [], //笔迹
        currentChirography: {}, //当前笔迹
        linePrack: [], //划线轨迹 , 生成线条的实际点
        headh: 0,
        uniq_id: '',
      };
    },
    computed: {
      hh() {
        return this.headh;
      },
    },
    onLoad({ uniq_id }) {
      this.uniq_id = uniq_id;
      console.log(this.uniq_id);
      let canvasName = this.canvasName;
      let ctx = wx.createCanvasContext(canvasName,this);

      this.ctx = ctx;
      var query = wx.createSelectorQuery();
      query
        .select('.handCenter')
        .boundingClientRect((rect) => {
          this.canvasWidth = rect.width;
          this.canvasHeight = rect.height;

          /* 将canvas背景设置为 白底，不设置  导出的canvas的背景为透明 */
          this.setCanvasBg('rgba(0,0,0,0)');
        })
        .exec();
    },
    methods: {
      // 笔迹开始
      uploadScaleStart(e) {
        if (e.type != 'touchstart') return false;
        let ctx = this.ctx;
        ctx.setFillStyle(this.lineColor); // 初始线条设置颜色
        ctx.setGlobalAlpha(this.transparent); // 设置半透明
        let currentPoint = {
          x: e.touches[0].x,
          y: e.touches[0].y,
        };
        let currentLine = this.currentLine;
        currentLine.unshift({
          time: new Date().getTime(),
          dis: 0,
          x: currentPoint.x,
          y: currentPoint.y,
        });
        this.currentPoint = currentPoint;
        // currentLine
        if (this.firstTouch) {
          this.cutArea = {
            top: currentPoint.y,
            right: currentPoint.x,
            bottom: currentPoint.y,
            left: currentPoint.x,
          };
          this.firstTouch = false;
        }
        this.pointToLine(currentLine);
      },
      // 笔迹移动
      uploadScaleMove(e) {
        if (e.type != 'touchmove') return false;
        if (e.cancelable) {
          // 判断默认行为是否已经被禁用
          if (!e.defaultPrevented) {
            e.preventDefault();
          }
        }
        let point = {
          x: e.touches[0].x,
          y: e.touches[0].y,
        };

        //测试裁剪
        if (point.y < this.cutArea.top) {
          this.cutArea.top = point.y;
        }
        if (point.y < 0) this.cutArea.top = 0;

        if (point.x > this.cutArea.right) {
          this.cutArea.right = point.x;
        }
        if (this.canvasWidth - point.x <= 0) {
          this.cutArea.right = this.canvasWidth;
        }
        if (point.y > this.cutArea.bottom) {
          this.cutArea.bottom = point.y;
        }
        if (this.canvasHeight - point.y <= 0) {
          this.cutArea.bottom = this.canvasHeight;
        }
        if (point.x < this.cutArea.left) {
          this.cutArea.left = point.x;
        }
        if (point.x < 0) this.cutArea.left = 0;

        this.lastPoint = this.currentPoint;
        this.currentPoint = point;

        let currentLine = this.currentLine;
        currentLine.unshift({
          time: new Date().getTime(),
          dis: this.distance(this.currentPoint, this.lastPoint),
          x: point.x,
          y: point.y,
        });

        this.pointToLine(currentLine);
      },
      // 笔迹结束
      uploadScaleEnd(e) {
        if (e.type != 'touchend') return 0;
        let point = {
          x: e.changedTouches[0].x,
          y: e.changedTouches[0].y,
        };
        this.lastPoint = this.currentPoint;
        this.currentPoint = point;

        let currentLine = this.currentLine;
        currentLine.unshift({
          time: new Date().getTime(),
          dis: this.distance(this.currentPoint, this.lastPoint),
          x: point.x,
          y: point.y,
        });

        if (currentLine.length > 2) {
          var info =
            (currentLine[0].time - currentLine[currentLine.length - 1].time) / currentLine.length;
          //$("#info").text(info.toFixed(2));
        }
        //一笔结束，保存笔迹的坐标点，清空，当前笔迹
        //增加判断是否在手写区域；
        this.pointToLine(currentLine);
        var currentChirography = {
          lineSize: this.lineSize,
          lineColor: this.lineColor,
        };
        var chirography = this.chirography;
        chirography.unshift(currentChirography);
        this.chirography = chirography;

        var linePrack = this.linePrack;
        linePrack.unshift(this.currentLine);
        this.linePrack = linePrack;
        this.currentLine = [];
      },
      retDraw() {
        this.ctx.clearRect(0, 0, 700, 730);
        this.ctx.draw();

        //设置canvas背景
        this.setCanvasBg('rgba(0,0,0,0)');
      },
      //画两点之间的线条；参数为:line，会绘制最近的开始的两个点；
      pointToLine(line) {
        this.calcBethelLine(line);
        return;
      },
      //计算插值的方式；
      calcBethelLine(line) {
        if (line.length <= 1) {
          line[0].r = this.radius;
          return;
        }
        let x0,
          x1,
          x2,
          y0,
          y1,
          y2,
          r0,
          r1,
          r2,
          len,
          lastRadius,
          dis = 0,
          time = 0,
          curveValue = 0.5;
        if (line.length <= 2) {
          x0 = line[1].x;
          y0 = line[1].y;
          x2 = line[1].x + (line[0].x - line[1].x) * curveValue;
          y2 = line[1].y + (line[0].y - line[1].y) * curveValue;
          //x2 = line[1].x;
          //y2 = line[1].y;
          x1 = x0 + (x2 - x0) * curveValue;
          y1 = y0 + (y2 - y0) * curveValue;
        } else {
          x0 = line[2].x + (line[1].x - line[2].x) * curveValue;
          y0 = line[2].y + (line[1].y - line[2].y) * curveValue;
          x1 = line[1].x;
          y1 = line[1].y;
          x2 = x1 + (line[0].x - x1) * curveValue;
          y2 = y1 + (line[0].y - y1) * curveValue;
        }
        //从计算公式看，三个点分别是(x0,y0),(x1,y1),(x2,y2) ；(x1,y1)这个是控制点，控制点不会落在曲线上；实际上，这个点还会手写获取的实际点，却落在曲线上
        len = this.distance(
          {
            x: x2,
            y: y2,
          },
          {
            x: x0,
            y: y0,
          },
        );
        lastRadius = this.radius;
        for (let n = 0; n < line.length - 1; n++) {
          dis += line[n].dis;
          time += line[n].time - line[n + 1].time;
          if (dis > this.smoothness) break;
        }

        this.radius =
          Math.min((time / len) * this.pressure + this.lineMin, this.lineMax) * this.lineSize;
        line[0].r = this.radius;
        //计算笔迹半径；
        if (line.length <= 2) {
          r0 = (lastRadius + this.radius) / 2;
          r1 = r0;
          r2 = r1;
          //return;
        } else {
          r0 = (line[2].r + line[1].r) / 2;
          r1 = line[1].r;
          r2 = (line[1].r + line[0].r) / 2;
        }
        let n = 5;
        let point = [];
        for (let i = 0; i < n; i++) {
          let t = i / (n - 1);
          let x = (1 - t) * (1 - t) * x0 + 2 * t * (1 - t) * x1 + t * t * x2;
          let y = (1 - t) * (1 - t) * y0 + 2 * t * (1 - t) * y1 + t * t * y2;
          let r = lastRadius + ((this.radius - lastRadius) / n) * i;
          point.push({
            x: x,
            y: y,
            r: r,
          });
          if (point.length == 3) {
            let a = this.ctaCalc(
              point[0].x,
              point[0].y,
              point[0].r,
              point[1].x,
              point[1].y,
              point[1].r,
              point[2].x,
              point[2].y,
              point[2].r,
            );
            a[0].color = this.lineColor;
            // let bethelPoint = this.bethelPoint;
            // bethelPoint = bethelPoint.push(a);
            this.bethelDraw(a, 1);
            point = [
              {
                x: x,
                y: y,
                r: r,
              },
            ];
          }
        }
        this.currentLine = line;
      },
      //求两点之间距离
      distance(a, b) {
        let x = b.x - a.x;
        let y = b.y - a.y;
        return Math.sqrt(x * x + y * y);
      },
      ctaCalc(x0, y0, r0, x1, y1, r1, x2, y2, r2) {
        let a = [],
          vx01,
          vy01,
          norm,
          n_x0,
          n_y0,
          vx21,
          vy21,
          n_x2,
          n_y2;
        vx01 = x1 - x0;
        vy01 = y1 - y0;
        norm = Math.sqrt(vx01 * vx01 + vy01 * vy01 + 0.0001) * 2;
        vx01 = (vx01 / norm) * r0;
        vy01 = (vy01 / norm) * r0;
        n_x0 = vy01;
        n_y0 = -vx01;
        vx21 = x1 - x2;
        vy21 = y1 - y2;
        norm = Math.sqrt(vx21 * vx21 + vy21 * vy21 + 0.0001) * 2;
        vx21 = (vx21 / norm) * r2;
        vy21 = (vy21 / norm) * r2;
        n_x2 = -vy21;
        n_y2 = vx21;
        a.push({
          mx: x0 + n_x0,
          my: y0 + n_y0,
          color: '#1A1A1A',
        });
        a.push({
          c1x: x1 + n_x0,
          c1y: y1 + n_y0,
          c2x: x1 + n_x2,
          c2y: y1 + n_y2,
          ex: x2 + n_x2,
          ey: y2 + n_y2,
        });
        a.push({
          c1x: x2 + n_x2 - vx21,
          c1y: y2 + n_y2 - vy21,
          c2x: x2 - n_x2 - vx21,
          c2y: y2 - n_y2 - vy21,
          ex: x2 - n_x2,
          ey: y2 - n_y2,
        });
        a.push({
          c1x: x1 - n_x2,
          c1y: y1 - n_y2,
          c2x: x1 - n_x0,
          c2y: y1 - n_y0,
          ex: x0 - n_x0,
          ey: y0 - n_y0,
        });
        a.push({
          c1x: x0 - n_x0 - vx01,
          c1y: y0 - n_y0 - vy01,
          c2x: x0 + n_x0 - vx01,
          c2y: y0 + n_y0 - vy01,
          ex: x0 + n_x0,
          ey: y0 + n_y0,
        });
        a[0].mx = a[0].mx.toFixed(1);
        a[0].mx = parseFloat(a[0].mx);
        a[0].my = a[0].my.toFixed(1);
        a[0].my = parseFloat(a[0].my);
        for (let i = 1; i < a.length; i++) {
          a[i].c1x = a[i].c1x.toFixed(1);
          a[i].c1x = parseFloat(a[i].c1x);
          a[i].c1y = a[i].c1y.toFixed(1);
          a[i].c1y = parseFloat(a[i].c1y);
          a[i].c2x = a[i].c2x.toFixed(1);
          a[i].c2x = parseFloat(a[i].c2x);
          a[i].c2y = a[i].c2y.toFixed(1);
          a[i].c2y = parseFloat(a[i].c2y);
          a[i].ex = a[i].ex.toFixed(1);
          a[i].ex = parseFloat(a[i].ex);
          a[i].ey = a[i].ey.toFixed(1);
          a[i].ey = parseFloat(a[i].ey);
        }
        return a;
      },
      bethelDraw(point, is_fill, color) {
        let ctx = this.ctx;
        ctx.beginPath();
        ctx.moveTo(point[0].mx, point[0].my);
        if (undefined != color) {
          ctx.setFillStyle(color);
          ctx.setStrokeStyle(color);
        } else {
          ctx.setFillStyle(point[0].color);
          ctx.setStrokeStyle(point[0].color);
        }
        for (let i = 1; i < point.length; i++) {
          ctx.bezierCurveTo(
            point[i].c1x,
            point[i].c1y,
            point[i].c2x,
            point[i].c2y,
            point[i].ex,
            point[i].ey,
          );
        }
        ctx.stroke();
        if (undefined != is_fill) {
          ctx.fill(); //填充图形 ( 后绘制的图形会覆盖前面的图形, 绘制时注意先后顺序 )
        }
        ctx.draw(true);
      },
      selectColorEvent(str, color) {
        this.selectColor = str;
        this.lineColor = color;
      },
      //将Canvas内容转成 临时图片 --> cb 为回调函数 形参 tempImgPath 为 生成的图片临时路径
      canvasToImg(cb) {
        //这种写法移动端 出不来
        this.ctx.draw(true, () => {
          wx.canvasToTempFilePath({
            canvasId: 'handWriting',
            fileType: 'png',
            quality: 1, //图片质量
            success(res) {
              // console.log(res.tempFilePath, 'canvas生成图片地址');

              wx.showToast({
                title: '执行了吗？',
                icon: 'none',
              });

              cb(res.tempFilePath);
            },
          });
        });
      },
      subCanvass() {
        uni.showModal({
          title: '温馨提示',
          content: '确定要生成签名吗',
          success: (res) => {
            if (res.confirm) {
              this.subCanvas();
            }
          },
        });
      },
      //完成
      subCanvas() {
        let that = this;
        try {
          // this.ctx.draw(true, () => {
            wx.canvasToTempFilePath({
              canvasId: 'handWriting',
              fileType: 'png',
              quality: 1, //图片质量
              success: (res) => {
                uni.showLoading({
                  mask: true,
                  title: '保存中',
                });
                console.log(res.tempFilePath, '已完成，canvas生成图片地址',that.uniq_id);
				console.log("save sign =>",cfg.baseUrl + '/addons/shopro/second.Letter/saveSign');
                uni.uploadFile({
                  header: {
                    token: uni.getStorageSync('token'),
                  },
                  url: cfg.baseUrl + '/addons/shopro/second.Letter/saveSign',
                  filePath: res.tempFilePath,
                  formData: {
                    uniq_id: that.uniq_id,
                  },
                  name: 'file',
                  success: (res) => {
                    console.log(res);
                    if (200 == res.statusCode) {
                      let data = JSON.parse(res.data);
                      if (data?.code == 1) {
                        uni.showToast({
                          title: '签名成功',
                          icon: 'none',
                          mask: true,
                        });
                        uni.$emit('WEITE_SIGN', true);
                        setTimeout(() => {
                          uni.navigateBack({
                            delta: 2,
                          });
                        }, 500);
                      } else {
                        uni.showToast({
                          title: data.msg,
                          icon: 'none',
                          mask: true,
                        });
                      }
                    }
                    uni.hideLoading();
                  },
                });
                // sheep.$api.second
                //   .saveSign({
                //     uniq_id: that.uniq_id,
                //     sign: 'data:image/png;base64,' + Base64.encode(res.tempFilePath),
                //   })
                //   .then((res) => {
                //     console.log(res);
                //     if (res?.code) {
                //       uni.showToast({
                //         title: '签名成功',
                //         icon: 'none',
                //         mask: true,
                //       });
                //       uni.$emit('WEITE_SIGN', true);
                //       setTimeout(() => {
                //         uni.navigateBack({
                //           delta: 2,
                //         });
                //       }, 500);
                //     }
                //   })
                //   .catch((err) => {
                //     console.log(err, 'eeerrrrreeeeeeeeeeeee');
                //   })
                //   .finally(() => {
                //     setTimeout(() => {
                //       uni.hideLoading();
                //     }, 100);
                //   });
              },
            });
          // });
        } catch (e) {
          console.log(e, 'eeeeeeeeeeeee');
        }
      },
      //保存到相册
      saveCanvasAsImg() {
        /*
  		this.canvasToImg( tempImgPath=>{
  			// console.log(tempImgPath, '临时路径');
  			wx.saveImageToPhotosAlbum({
  				filePath: tempImgPath,
  				success(res) {
  					wx.showToast({
  						title: '已保存到相册',
  						duration: 2000
  					});
  				}
  			})
  		} );
  */

        wx.canvasToTempFilePath({
          canvasId: 'handWriting',
          fileType: 'png',
          quality: 1, //图片质量
          success(res) {
            // console.log(res.tempFilePath, 'canvas生成图片地址');
            wx.saveImageToPhotosAlbum({
              filePath: res.tempFilePath,
              success(res) {
                wx.showToast({
                  title: '已保存到相册',
                  duration: 2000,
                });
              },
            });
          },
        });
      },
      //预览
      previewCanvasImg() {
        wx.canvasToTempFilePath({
          canvasId: 'handWriting',
          fileType: 'jpg',
          quality: 1, //图片质量
          success(res) {
            // console.log(res.tempFilePath, 'canvas生成图片地址');
            wx.previewImage({
              urls: [res.tempFilePath], //预览图片 数组
            });
          },
        });

        /*	//移动端出不来  ^~^！！
  				this.canvasToImg( tempImgPath=>{
  					wx.previewImage({
  						urls: [tempImgPath], //预览图片 数组
  					})
  				} );
  		*/
      },
      //上传
      uploadCanvasImg() {
        wx.canvasToTempFilePath({
          canvasId: 'handWriting',
          fileType: 'png',
          quality: 1, //图片质量
          success(res) {
            console.log(res.tempFilePath, '待上传服务器canvas生成图片地址');
            //上传
            wx.uploadFile({
              url: 'https://xxx/uploadSignFile', // 仅为示例，非真实的接口地址
              filePath: res.tempFilePath,
              name: 'file_signature',
              formData: {
                user: 'test',
              },
              success(res) {
                if (res.code == 1) {
                  wx.showToast({
                    title: '上传成功',
                    icon: 'none',
                    duration: 2000,
                  });
                } else {
                  uni.showToast({
                    title: res.message,
                    icon: 'none',
                    position: 'bottom',
                    duration: 3000,
                  });
                }
              },
            });
          },
        });
      },
      //设置canvas背景色  不设置  导出的canvas的背景为黑色
      //@params：字符串  color
      setCanvasBg(color) {
        /* 将canvas背景设置为 白底，不设置  导出的canvas的背景默认为黑色 */
        //rect() 参数说明  矩形路径左上角的横坐标，左上角的纵坐标, 矩形路径的宽度, 矩形路径的高度
        //这里是 canvasHeight - 4 是因为下边盖住边框了，所以手动减了写
        this.ctx.rect(0, 0, this.canvasWidth, this.canvasHeight - 4);
        this.ctx.setFillStyle(color);
        this.ctx.fill(); //设置填充
        this.ctx.draw(); //开画
      },
      //返回
      back() {
        uni.navigateBack();
      },
      getHeaderHeight(h) {
        this.headh = h;
      },
    },
  };
</script>

<style>
  page {
    background: #fbfbfb;
    height: auto;
    overflow: hidden;
  }

  .wrapper {
    width: 100%;
    margin: 0rpx;
    overflow: hidden;
    display: flex;
    align-content: center;
    flex-direction: row;
    justify-content: center;
    font-size: 28rpx;
    background: #f4f9fd;
    padding-bottom: 28rpx;
  }

  .handWriting {
    /* background: #fff url('@/static/img/signbg.png') no-repeat; */
    background: #fff;
    width: 100%;
    height: 100%;
    background-size: contain;
  }

  .handRight {
    display: inline-flex;
    align-items: center;
    width: 24rpx;
  }

  .handCenter {
    flex: 5;
    overflow: hidden;
    box-sizing: border-box;
  }

  .handTitle {
    transform: rotate(90deg);
    flex: 1;
    color: #666;
  }

  .handBtn button {
    font-size: 32rpx;
    color: #303133;
    border: none;
    background: none;
  }

  .handBtn button::after {
    border: none;
  }

  .handBtn {
    width: 124rpx;
    height: 100%;
    display: inline-flex;
    flex-direction: column;
    justify-content: space-between;
    align-content: space-between;
    flex: 1;
    flex-shrink: 0;
    position: relative;
  }

  .delBtn {
    position: absolute;
    top: 50rpx;
    left: 0rpx;
    transform: rotate(90deg);
    color: #666;
  }

  .delBtn image {
    position: absolute;
    top: 13rpx;
    left: 25rpx;
  }

  .subBtn {
    position: absolute;
    bottom: 280rpx;
    left: -50rpx;
    transform: rotate(90deg);
    color: #fff !important;
    text-align: center;
    background: linear-gradient(90deg, #ebac60 5%, #f3ca96 100%) !important;
    box-shadow: 0rpx 6rpx 9rpx 0rpx rgba(246, 197, 138, 0.56);
    justify-content: center;
    border-radius: 28rpx;
    width: 222rpx;
    height: 80rpx;
    font-size: 36rpx;
    height: auto;
    line-height: auto;
  }

  /*Peach - 新增 - 保存*/

  .saveBtn {
    position: absolute;
    top: 375rpx;
    left: 0rpx;
    transform: rotate(90deg);
    color: #666;
  }

  .previewBtn {
    position: absolute;
    top: 180rpx;
    left: 0rpx;
    transform: rotate(90deg);
  }

  .backBtn {
    position: absolute;
    top: 305rpx;
    left: 0rpx;
    transform: rotate(90deg);
  }

  .uploadBtn {
    position: absolute;
    top: 625rpx;
    left: 0rpx;
    transform: rotate(90deg);
    color: #666;
  }

  /*Peach - 新增 - 保存*/

  .black-select {
    width: 60rpx;
    height: 60rpx;
    position: absolute;
    top: 30rpx;
    left: 25rpx;
  }

  .black-select.color_select {
    width: 90rpx;
    height: 90rpx;
    top: 100rpx;
    left: 10rpx;
  }

  .red-select {
    width: 60rpx;
    height: 60rpx;
    position: absolute;
    top: 140rpx;
    left: 25rpx;
  }

  .red-select.color_select {
    width: 90rpx;
    height: 90rpx;
    top: 120rpx;
    left: 10rpx;
  }
</style>
